They're pitching this as desktop sibling to the mobile apps, not a Lightroom replacement, but only time will tell.
I remember that my very first reaction to Lightroom Mobile was to ask if I could run it on my laptop as the "networked Lightroom" I'd always expected. For some of us this Nimbus might be that tool, a desktop client for Lightroom that uses the cloud rather than local networks. But others find Lightroom too difficult, so for them it might be Adobe's Photos-equivalent. And while it's natural to wonder about resources, a lot of Lightroom enthusiasts have suggested there is space for a Lite version - too.